package com.gulimall.gateway.confign;

import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.BlockRequestHandler;
import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
import com.alibaba.fastjson.JSON;
import com.atguigu.common.exception.BizCodeEnume;
import com.atguigu.common.utils.R;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Configuration
public class SentinelGatewayConfig {

    /**
     * 响应式编程
     */

    public SentinelGatewayConfig() {
        GatewayCallbackManager.setBlockHandler (new BlockRequestHandler () {
            //网关限流了请求，就会调用此回调
            @Override
            public Mono<ServerResponse> handleRequest(ServerWebExchange exchange, Throwable t) {

                R error = R.error (BizCodeEnume.TO_MANY_REQUEST.getCode (), BizCodeEnume.TO_MANY_REQUEST.getMsg ());
                String errorJson = JSON.toJSONString (error);

                Mono<ServerResponse> body = ServerResponse.ok ().body (Mono.just (errorJson), String.class);
                return body;
            }
        });
    }

}
